Your test case doesn't match up with the problem statement. The problem statement mentions monotonically decreasing, while the test case tests for just decreasing.
Swap the first and last columns
Factorize THIS, buddy
Back to basics 8 - Matrix Diagonals
Return unique values without sorting
Calculate distance travelled when given radius and rotations
Number Puzzle - 118
Number Puzzle - 041
Number Puzzles - 008
Matrix Pattern 5
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